The rear wheel bearings on the wagons are double row which means on a practical basis that the bearings will last a very long time after the noise starts before failing. To check the bearings, jack up the rear of the vehicle and alternately pull on the top and bottom of the tire to check the play. If the bearing is bad there will be substantial play. Also, the bottom of the outer brake pad and the top of the inner brake pad will wear considerably more than vice versa. The right wheel bearing on my 91 300TE was bad from about 130K miles until I replaced it at 170K miles with no ill effects other than premature rear brake pad wear and rear tire wear. Mark